215 ILCS 5/543.3

The liquidator of an insolvent company shall notify the policyholders of the insolvent company who are residents of this State of the entry of an Order of Liquidation against the company and of their rights under this Article. Such notification shall be mailed to the last known address of such policyholders, where available, but if sufficient information for notification by mail is not available, notice by publication in a newspaper of general circulation shall be sufficient. If the insolvent company is domiciled in another state and the liquidator fails to give notice which satisfies the purposes of this Section, such notice shall be given by the Director as ancillary receiver or if the insolvent company is domiciled in another state and there is no ancillary receiver in this State, the Fund shall give such notice provided the necessary information is made available to the Fund by the liquidator. The form of the notice given by the Director as either liquidator or ancillary receiver shall be submitted to the Fund for its approval prior to mailing or publication.